Technical Field

The invention relates generally to a piston mold structure.

The invention particularly relates to a piston mold structure that enables the production of pistons used in internal combustion engines with low material consumption.

Prior Art

Presently, piston mold engravings are generally produced from one-piece block materials, so it is very difficult to process the narrow cavities on the mold resulting from the piston shape and to correct the molds after the forging process. Due to the difficulty of finding suitable machining tools in the processing of these deep cavities and the tools found being very sensitive in machining operations and are exhausted quickly, mold production is much more costly than general forged parts. In addition, it is difficult to detect the defects that may occur in the processing of the molds and these defects cause the mold performance to be low. In addition to these, when the pusher parts that may coincide with deep cavity regions are considered, the mold lengths are shortened due to their pusher strokes, which increases the amount of material spent for molding in total.

In the production methods in the current technique, a high rate of material consumption occurs due to the fact that the pistons are complex shaped parts. Material consumption leads to an increase in piston production costs. In addition, since the production rate is low in the present methods, process costs are also quite high.

As a result, improvements are being made in piston production methods, so there is a need for new structures that will eliminate the disadvantages mentioned above and provide solutions to existing systems.

Purpose of the Invention The invention relates to a piston production method, which meets the requirements mentioned above, eliminates all disadvantages and provides some additional advantages.

The main purpose of the invention is to provide mold structure for pistons used in internal combustion engines that are produced with low material consumption.

A purpose of the invention is to minimize process costs by manufacturing pistons with low material consumption.

A purpose of the invention is to ensure that the pusher design can be made more detailed and functional, since this piston structure and the pusher region are separated from the active mold engraving.

A purpose of the invention is to prevent problems such as jamming of the pushers and parts during production.

In order to realize all the advantages mentioned above and which can be understood from the detailed explanation below, the present invention is a piston mold structure consisting of an upper mold that shapes the upper surface of the piston to be produced and a lower mold that shapes the lower surface; the said structure comprises the following: an upper mold outer mating part-1 that ensures the resistance of the upper mold to the pressure generated during piston forming, an upper mold outer mating part - 2 that is mounted on the upper mold outer mating part -1 , which surrounds the lower mold when the press closes and shapes the outer surfaces of the piston part in the closed engraving, at least one upper mold inner mating part that shapes the inner surfaces of the piston part during pressing, top pushers that allow the piston part to exit the top mold engraving, lower pushers that move the piston part from its current mold to the position that allows it to move to the next mold, holders that hold the upper mold and bottom mold together, a top cover that holds the upper mold together with the holder, and a lower cover that holds the bottom mold together with the holder.

The structural and characteristic features of the invention and all its advantages will be understood more clearly by means of the figures given below and the detailed explanation written with reference to these figures. Therefore, evaluation should be made by taking these figures and detailed explanation into consideration.

Brief Description of the Figures

In order to understand the structure of the existing invention and its advantages with additional elements in the best way, it should be evaluated together with the figures described below.

Figure 1 : Representative view of the piston mold structure, which is the subject of the invention.

Reference Numbers

T1. Holder

K1 . Upper mold outer mating part-1

K2. Upper mold outer mating part-2

K3. Upper mold inner mating part

K4. Lower mold

11. Top pusher

12. Bottom pusher

P1. Top cover

P2. Bottom cover

Detailed Description of the Invention

In this detailed description, preferred embodiments of the piston mold construction, which is the subject of the invention are described only for a better understanding of the subject and without any limiting effect.

The invention, whose representative view is given in Figure 1 , is a piston mold structure consisting of an upper mold that shapes the upper surface of the piston to be manufactured and a lower mold (K4) that shapes the lower surface and comprises the following.

• An upper mold outer mating part-1 (K1 ), which ensures the resistance of the upper mold to the pressure generated during piston forming • An upper mold outer mating part-2 (K2), mounted on the upper mold outer mating part-1 (K1 ), which surrounds the lower mold (K4) when the press closes, shaping the outer surfaces of the piston part in closed engraving.

• At least one upper mold inner mating part (K3), which is mounted in the upper mold outer mating part-2 (K2) during pressing, shaping the inner surfaces of the piston part,

• Top pushers (11 ) that allow the piston part to come out of the top mold engraving,

• Bottom pushers (I2), which carry the piston part from the mold it is in to the position that allows it to pass to the next mold,

• Holders (T 1 ) that hold the upper mod and the bottom mold (K4) together,

• A top cover (P1 ) that holds the top mold together with the holder (T 1 ), and

• A bottom cover (P2) that holds the bottom mold (K4) together with the holder (T 1 ).

The piston mold structure, which is the subject of the invention, consists of two parts: upper mold and lower mold (K4). Here, the upper mold is divided into two parts as upper mold outer mating part-2 (K2), which shapes the outer surfaces of the piston part to be produced, and upper mold inner mating part (K3), which shapes the inner surfaces. Thus, the areas of the upper mold with deep surfaces are made easier to process. In order to facilitate the assembly here, upper mold inner mating part (K3) is assembled in upper mold outer mating part-2 (K2) during pressing. The upper mold consisting of upper mold outer mating part-1 (K1 ), upper mold outer mating part-2 (K2) and upper mold inner mating part (K3) is placed in a holder (T1 ) located therein. Then it is closed with a top cover (P1 ) and tightened with the help of screws.

Due to the overload on the outer surfaces of the piston during the forming of the part, upper mold outer mating part-2 (K2) and upper mold outer mating part-1 (K1 ), which are one piece in the traditional mold layout, are mounted to each other by hot insertion method. Thus, a structure resistant to mold stresses during forging is formed. The upper mold outer mating part-1 (K1 ) mentioned above ensures the resistance of the upper mold to the pressure generated during piston forming.

Due to the reverse forging of the piston part, it is more difficult than usual to remove it from the upper mold package. In order to facilitate this situation, a top pusher (11 ) is added to the spring and air vent systems to push the part from two points. In the lower mold (K4) layout, the lower mold (K4) is produced by precision processing especially for the operation of the closed mold relationship between upper mold outer mating part-2 (K2) and lower mold (K4). Thus, lower mold (K4) enters into the upper mold outer mating part-2 (K2) under the press stroke and prevents the material from coming out during forming.

By means of the bottom pusher (12), it is ensured that the formed part reaches the height required to be transported to the next operation.

All these top and bottom package parts are produced by precision machining on lathe and milling machines and after their production, they are mounted on the holder (T1 ) and packaged with top cover (P1) and bottom cover (P2) parts.

The piston mold structure, which is the subject of the invention, is provided by producing the part that will give the pistons its internal form and the part that will give the outer form separately and then assembling these parts to each other. In addition, the material surrounding the inner and outer form of the piston is assembled by the passing method and the stress resistance is increased during the forming phase of the mold. In this way, none of these mold parts, which are produced as three separate parts, have a narrow and deep cavity. Machining and production methods have been improved in terms of time and tool consumption. With this piston structure, the pusher zone is also separated from the active mold engraving and the pusher design can be made in more detail and functional. Thus, problems such as jamming of the pusher and parts seen during production are prevented. When all these issues are brought together, significant savings are achieved in the amount of material spent on molding.